только что досмотрел сам, там ошибка в ссылке нового тега отправки формы
Cotonti/modules/forums/inc/forums.newtopic.php
в строке
'FORUMS_NEWTOPIC_FORM_ACTION' => cot_url('forums', ['m' => 'newtopic', 'a' => 'ewtopic', 's' => $s]),
замените 'ewtopic' на 'newtopic' то есть пропущена буква n в начале.
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